Hearing aid



FIG. 1 is a perspective view of a hearing aid embodying our design;

FIG. 2 is a right side view of the hearing aid device shown in FIG. 1;

FIG. 3 is a left side view of hearing aid device shown in FIG. 1;

FIG. 4 is a front view of the hearing aid device shown in FIG. 1;

FIG. 5 is a rear view of the hearing aid device shown in FIG. 1;

FIG. 6 is a top view of the hearing aid device shown in FIG. 1; and,

FIG. 7 is a bottom view of the hearing aid device shown in FIG. 1.

The broken lines in FIG. 5 are included for the purpose of illustrating portions of the hearing aid that form no part of the claimed design. 

The ornamental design for a hearing aid, as shown and described. 